BirdAnalyst
Species · BCR 33 · BBS 2025 Release · 1966–2024

Bell's Sparrow In Sonoran and Mojave Deserts

All regionsSonoran and Mojave DesertsGeneralists

Bell's Sparrow in Sonoran and Mojave Deserts has edged up: up 23% on the route-weighted index since 1972.

+23%Since 1972
16Routes In Region
54Years

Notable Signals

No notable trend signals for Bell's Sparrow in Sonoran and Mojave Deserts. See the full index history below.

Forecast

If the recent trend holds, Bell's Sparrow in Sonoran and Mojave Deserts is projected to rise about 38% by 2029 — from 0.83 in 2024 to a central estimate of 1.1 (95% range 0.00–2.4). A 5-year backtest shows a typical error of ±945.2%, with 100% of held-out values landing inside the 95% band.

+38%Change by 2029
1.1Projected 2029 index
0.00–2.495% range
±945.2%Backtest error
19692029
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected index95% low95% high
20251.10.002.4
20261.10.002.4
20271.10.002.4
20281.10.002.4
20291.10.002.4

Routes In Sonoran and Mojave Deserts

Routes recording Bell's Sparrow in Sonoran and Mojave Deserts.
Willow Springs 2CALIFORNIA162024
Calif CityCALIFORNIA122015
GoldstoneCALIFORNIA102009
OnyxCALIFORNIA52015
Ash MeadowsNEVADA42015
BarstowCALIFORNIA31998
Lucerne ValCALIFORNIA32024
Ft IrwinCALIFORNIA31981
Willow SpgsCALIFORNIA21981
InyokernCALIFORNIA22024
Lane MtnCALIFORNIA21973
Kelso ValleyCALIFORNIA22024
Joshua TreeCALIFORNIA21981
LenwoodCALIFORNIA12012
PearblossomCALIFORNIA12024
Lone PineCALIFORNIA12024

Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.